| FAST单元面板面型检测算法研究 |
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| 引用本文： | 周荣伟,朱丽春,胡金文,李为民.FAST单元面板面型检测算法研究[J].天文研究与技术,2012(1):14-20. |
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| 作者姓名： | 周荣伟 朱丽春 胡金文 李为民 |
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| 作者单位： | 中国科学院国家天文台;中国科学技术大学 |
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| 基金项目： | 国家自然科学基金(10878017)资助 |
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| 摘 要： | 500 m口径球面射电望远镜(Five-hundred-meter Aperture Spherical Radio Telescope,FAST)是一个超大口径的可动望远镜,有三项技术创新,一是选址,二是轻型馈源索支撑,三是主动反射面。在主动反射面上,单元面板的面型和面板的出厂加工精度对电磁波在反射面的汇聚有很大影响。FAST主反射面由4 600块三角形反射面板拼接而成,每块面板为边长11 m三角形,这对FAST反射面面板的测量技术提出了更高的要求。摄影测量直接在影像上进行量测,无需接触物体本身;所摄影像信息丰富,可以从中获得所研究物体的大量几何信息和物理信息;适用于大范围、多目标测量,效率高。目前世界上最大的射电望远镜,如GBT和ARECIBO都是采用摄影测量技术进行反射面面形检测。在对现有的面型检测技术调研并试验后,提出基于数字近景摄影测量的方法,对FAST反射面11 m单元面板的面型进行检测,数分钟完成反射面板面型的一次检测,测量精度达到2.5 mm,经过调整后的单元面板的面型精度达到了3.0 mm,结果表明摄影测量应用于FAST反射面单元面板面型检测是可行的。
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| 关 键 词： | FAST 射电望远镜 反射面 摄影测量 面型检测 |
Study of a Measurement Algorithm for the Surface of a Single Panel of the Reflector of the FAST |
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| Zhou Rongwei,Zhu Lichun,Hu Jinwen,Li Weimin.Study of a Measurement Algorithm for the Surface of a Single Panel of the Reflector of the FAST[J].Astronomical Research & Technology,2012(1):14-20. |
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| Authors: | Zhou Rongwei Zhu Lichun Hu Jinwen Li Weimin |
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| Institution: | 1.National Astronomical Observatories,Chinese Academy of Sciences,Beijing,100012,China 2.University of Science and Technology of China,Hefei 230026,China) |
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| Abstract: | The FAST(Five hundred meter Aperture Spherical Radio Telescope) will be the largest radio telescope in the world.There are three outstanding technological innovations in the FAST project: the unique Karst depression as the site for antenna,the light-weight focus cabin driven by cables and servomechanisms,and the active main reflector.When we set the main reflector,the surface shape(including errors in manufacturing) of each of its panels has significant influence on the convergence of electromagnetic waves.It is necessary to measure the surface shape so that it can be set correctly.The FAST main reflector consists of 4 600 triangular panels spliced together,each of which has a side length of 11 meters.The large sizes require certain fine technique for measuring surface shapes.In the photogrammetry a measured object is not physically contacted but measured through its image.The photogrammetry can have high efficiency when applied to wide-spread or multiple objects.Currently,the projects of world’ s largest radio telescopes,such as the GBT and ARECIBO reflectors all use the photogrammetry for surface measurement.After investigating and testing existing methods of surface measurement we propose a method of close-range digital photogrammetry.With this method,the surface shape of an eleven-meter panel of the FAST reflector can be measured in a few minutes.ur results show that the accuracy of the method in measuring a single panel is 2.30 mm with a standard deviation of 5.00 mm.The accuracy of the reflector panel surface was 3.0 mm after adjustment.It is thus feasible to use the photogrammetry for measuring surfaces of single panels of the FAST reflector. |
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| Keywords: | FAST Radio Telescope Reflector Photogrammetry Surface measurement |
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